I’ve got a plugin which creates several custom post_types. The breadcrumbs don’t work properly as they do not show the parent (archive) page. Most other themes and plugins I’ve used that generate breadcrumbs will work properly with custom post_types so long as in the custom post function you have 'has_archive' => true,, which I do.

I know this is a shot in the dark, but any ideas? It looks like framework/php/class-breadcrumb.php includes a section designed to find the proper breadcrumb for custom post_types, but it isn’t working in my case.